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The black olm (Proteus anguinus parkelj Sket & Arntzen, 1994) is the only recognized subspecies of the olm other than the nominate subspecies. It is endemic to the underground waters near Črnomelj , Slovenia, an area smaller than 100 square kilometres (39 sq mi).
The olm (Proteus anguinus) of the western Balkan Peninsula. A cave salamander is a type of salamander that primarily or exclusively inhabits caves , a group that includes several species. Some of these animals have developed special, even extreme, adaptations to their subterranean environments.
Proteidae, is divided into two extant genera, Necturus with five North American species, and Proteus with one extant European species, the olm. A number of extinct genera are known extending back to the end of the Late Cretaceous. Family Proteidae. Genus Necturus. Alabama waterdog (N. alabamensis) Western waterdog (N. beyeri) Neuse River ...
Some aquatic species, such as sirens and amphiumas, have reduced or absent hind limbs, giving them an eel-like appearance, but in most species, the front and rear limbs are about the same length and project sideward, barely raising the trunk off the ground. The feet are broad with short digits, usually four on the front feet and five on the rear.
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A troglobite (or, formally, troglobiont) is an animal species, or population of a species, strictly bound to underground habitats, such as caves.These are separate from species that mainly live in above-ground habitats but are also able to live underground (eutroglophiles), and species that are only cave visitors (subtroglophiles and trogloxenes). [1]
More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]
Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs .